隔膜电沉积法制备片状氢氧化镁及其影响因素

发布时间：2018-06-05 00:31

本文选题：氢氧化镁 + 片状　；参考：《东北大学学报(自然科学版)》2017年09期

【摘要】：以氯化镁为原料,采用隔膜电沉积法制备了片状氢氧化镁.考察了氯化镁浓度、反应温度、电流密度对氢氧化镁形貌及颗粒粒径的影响.采用SEM和激光粒度分布仪对产物氢氧化镁的形貌和颗粒粒径大小进行了表征.结果表明,该法获得的产物沉降快且易分离;电解质浓度增加,片状形貌更大且更厚,颗粒粒径变大;反应温度升高,导致片状形貌缺陷增大,团聚更严重,颗粒粒径先减小后增大;电流密度增强,造成片状特性变差,最终出现枝状形貌,颗粒粒径减小.对样品进行BET检测,发现合成样品中比表面积最大可达82.36 m2/g,对甲基紫的吸附量可达1 256 mg/g.
[Abstract]:Sheet magnesium hydroxide was prepared by membrane electrodeposition with magnesium chloride as raw material. The effects of magnesium chloride concentration, reaction temperature and current density on the morphology and particle size of magnesium hydroxide were investigated. The morphology and particle size of magnesium hydroxide were characterized by SEM and laser particle size distribution instrument. The results show that the products prepared by this method have fast sedimentation and easy separation, increase electrolyte concentration, make the shape of the sheet larger and thicker, increase the particle size, increase the reaction temperature, lead to the increase of the defect and agglomeration of the lamellar morphology. The particle size first decreases and then increases, and the current density increases, which leads to the deterioration of the flake characteristics, and finally the appearance of dendritic morphology and the decrease of particle size. BET analysis showed that the maximum specific surface area of the synthesized samples was 82.36 m2 / g and the adsorption capacity of methyl violet was 1 256 mg / g.
【作者单位】：东北大学冶金学院;
【基金】：国家自然科学基金资助项目(51404054,51304044)
【分类号】：TQ132.2

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